Answer:
the answer is a A
Explanation:
Answer:
Compare
Explanation:
If the temperature is below zero, what will the precipitation most likely be?
A(hail, B(rain, C(snow, D(sleet.
Answer: C Snow
Explanation:
Because the temperature is low and it is below freezing temperature. Sorry if I am wrong.
Which process is a chemical change?
burning a match
boiling water
melting ice
breaking glass
Answer:
Burning a match... i'm pretty sure.
Explanation:
All the other are phisical changes while Fire is a chemical reaction.
Answer:
Burning a match is a chemical change.
Explanation:
Burning is defined as the rapid oxidation of a combustible material.
Complete oxidation of the match stick results in an entirely different compound (the ash) while electrons are lost by the wood of the match.
A sample of boron consist of 10B (mass 10.0 amu) and 11B(mass 11.0). If the average atomic mass of B is 10.8 amu, what is the % abundance of each boron isotope
Answer:
%abundance of isotope B-11 is 80%, therefore, the %abundance of isotope B-10 is 20%.
Explanation:
The average atomic mass of an element is actually a weighted average atomic mass, taking into account the percent abundance of the naturally occurring isotopes of the element.
To calculate the weighted average mass, you must take the sum of atomic masses of all the naturally occurring isotopes multiplied by their %abundance.
Ave At. Mass = sum of [(isotopic mass)(%abundance)]/100
If we let the %abundance of B-11 be represented by X, then the %abundance of B-10 must be (100-X).
Now we can set up the following equation and solve for X
10.8 = [(10)(100-X) + (11)(X)]/100
1080 = 1000 - 10X + 11X
80 = X
So, the %abundance of isotope B-11 is 80%, therefore, the %abundance of isotope B-10 is 20%.
Match the terms and the definitions Lesson 3.04 Question 6 options:
1.
The earth is in a position so that the North Pole is tilted most directly toward the sun.
2.
The tilt and revolution of the earth as it moves around the sun cause
3.
This is the day of the year with the least amount of daylight, which is due to the tilt of the earth's axis.
4.
Days and nights are equal length, and the noon sun is directly overhead.
Equinoxes
Winter Solstice
Summer Solstice
seasons
1. Summer Solstice
What is Summer Solstice?
Summer Solstice is an astronomical event that marks the longest day of the year and the official beginning of summer in the Northern Hemisphere. It takes place when the sun reaches its highest point in the sky, directly over the Tropic of Cancer. During this time, the days have the most hours of sunlight and the nights have the least hours of darkness. This is due to the Earth's tilt in relation to the Sun. On the day of the Summer Solstice, the sun rises earliest and sets latest. This event is celebrated around the world, with many cultures creating rituals to honor the season. In the U.S., some people celebrate by gathering together for festivals, bonfires and fireworks. Others mark the day by practicing yoga, meditating or spending time outdoors in nature. Summer Solstice is a time of renewal and celebration, a reminder of the power of light, and of the beauty of the changing seasons.
2. seasons
3. Winter Solstice
4. Equinoxes
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Phosphine (PH3) can be prepared by the reaction of calcium phosphide , Ca3P2: based on this equation : Ca3P2 + 6H2O —-> 3 Ca(OH)2 + 2 PH3
Based on this equation , which of the following statements are correct?
(a) one mole of Ca3P2 produces 2 mol of PH3
(b) one gram of Ca3P2 produces 2g of PH3
(c) Three moles of Ca(OH)2 are produced for each 2 mol of PH3 produced
(d) the mole ratio between phosphine and calcium phosphide is 2 mol PH3 over 1 mol Ca3P2
Taking into account the reaction stoichiometry, you can observe that:
one mole of Ca₃P₂ produces 2 mol of PH₃.the mole ratio between phosphine and calcium phosphide is 2 mol PH₃ over 1 mol Ca₃P₂.Reaction stoichiometryIn first place, the balanced reaction is:
Ca₃P₂ + 6 H₂O → 3 Ca(OH)₂ + 2 PH₃
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Ca₃P₂:1 mole H₂O: 6 molesCa(OH)₂: 3 molesPH₃: 2 molesThe molar mass of the compounds is:
Ca₃P₂: 182 g/mole H₂O: 18 g/moleCa(OH)₂: 74 g/molePH₃: 34 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Ca₃P₂: 1 mole ×182 g/mole= 182 grams H₂O: 6 moles× 18 g/mole= 108 gramsCa(OH)₂: 3 moles ×74 g/mole= 222 gramsPH₃: 2 moles ×34 g/mole= 68 gramsCorrect statementsThen, by reaction stoichiometry, you can observe that:
one mole of Ca₃P₂ produces 2 mol of PH₃.the mole ratio between phosphine and calcium phosphide is 2 mol PH₃ over 1 mol Ca₃P₂.Learn more about the reaction stoichiometry:
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What is kinetic energy?
A: energy that depends on an object’s motion
B: energy that exists in the form of heat
C: stored energy that depends on an object’s chemical composition
D: stored energy that depends on an object’s position
Answer:
the answer should be A. energy that depends on an object's motion
Answer: A
Explanation: Kinetic energy is energy of build up of motion .
What is the purpose of attaching the clip clamp with the graphite of the pencil to the battery
5. Chemistry helps firefighters
A. determine which chemicals to use to fight different types of fires
B. identify the temperatures at which different substances burn
C. know the angles at which they can safely deploy ladders
D. calculate how much water pressure is available at a hydrant
Answer:
A
Explanation:
determine which chemicals to use to fight different types of fires
the only one that relates to chem
Sue dissolved a certain amount of salt in 400 grams of water to obtain 405 grams of salt solution. What was the mass of the salt used to make the solution? 5 grams 10 grams 400 grams 405 grams
Explanation:
Sue added salt to water in order to make a salt solution
the original amount of water is 400 grams
In order for Sue to obtain 405 grams of salt solution using 400 grams of water, 5 grams of salt must be added.
Answer: (D) 5 grams
Explanation: the reason I would chose this is because if you do the simple math of 405-400 you get 5 so if he has 400 in the beginning he would have to add something to make it 405 grams and that something would have to be 5 grams of salt. hoped this helped no need for brainiest just happy to help.:)
and please tell me if I am wrong.
3. Nitrogen contains two naturally occurring isotopes, N-14 with a mass of 14.003 amu and N-15 with a mass of 15.000 amu. What are the percentages of the two isotopes in naturally occurring nitrogen?
Answer:
Explanation:
fe-45 and O-15 im sure :)
what do columns on the periodic table tell us?
Answer:
Column on the periodic table tell the number of valence electrons and the types of chemicals, such as metals, nonmetals, alkaline earth metals, metalloids, halogens, noble gases.
Explanation:
The periodic table is an arrangement of the elements in order of their atomic numbers so that elements with similar properties appear in the same vertical column or group.
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Pure copper may be produced by the reaction of copper (I) sulfide with oxygen gas:
Cu2S (s) + O2 (g) --> 2Cu (s) + SO2 (g)
If 3-kg of copper (I) sulfide reacts with excess oxygen, what mass of copper metal may be produced??
If 3-kg of copper (I) sulfide reacts with excess oxygen, 3.9 kg of copper metal may be produced.
Let's consider the following balanced equation for the obtaining of pure copper.
Cu₂S(s) + O₂(g) ⇒ 2 Cu(s) + SO₂(g)
The molar mass of Cu₂S is 95.61 g/mol. The moles corresponding to 3 kg (3000 g) of Cu₂S are:
[tex]3000 g \times \frac{1mol}{95.61g} = 31 mol[/tex]
The molar ratio of Cu₂S to Cu is 1:2. The moles of Cu obtained from 31 moles of Cu₂S are:
[tex]31 mol Cu_2S \times \frac{2molCu}{1molCu_2S} =62 mol Cu[/tex]
The molar mass of Cu is 63.55 g/mol. The mass corresponding to 62 moles of Cu is:
[tex]62 mol \times \frac{63.55g}{mol} = 3.9 \times 10^{3} g = 3.9 kg[/tex]
If 3-kg of copper (I) sulfide reacts with excess oxygen, 3.9 kg of copper metal may be produced.
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how many grams of water are needed to react with 71.0g CaN2?
Answer:
1
Explanation:
Mass of
C
a
C
N
2
= 75.0 g
From the equation,
C
a
C
N
2
(
s
)
+
3
H
2
O
(
l
)
→
C
a
C
O
3
(
s
)
+
2
N
H
3
(
g
)
1 mol of
C
a
C
N
2
reacts with 3 moles of water to give calcium carbonate and ammonia.
Number of moles of
C
a
C
N
2
,
n
=
G
i
v
e
n
m
a
s
s
M
o
l
a
r
m
a
s
s
Molar mass of
C
a
C
N
2
= 92.11 g/mol
Therefore,
n
C
a
C
N
2
=
75
g
92
.11
g
/
m
o
l
=
0
.814
m
o
l
Moles of water =Therefore,
n
C
a
C
N
2
=
75
g
92
.11
g
/
m
o
l
=
0
.814
m
o
l
Moles of water =
3
×
0
.814
m
o
l
e
s
=
2
.442
m
o
l
e
s
Mass of water needed;
=
m
o
l
e
s
o
f
w
a
t
e
r
×
m
o
l
a
r
m
a
s
s
o
f
w
a
t
e
r
=
2
.442
m
o
l
×
18
g
/
m
o
l
=
43
.956
g
Thus, 43.96 g of water is needed to react with 75 g of
C
a
C
N
2
.
What happens to the temperature of water as it is boiling? Increase, decrease, or remains the same?
Answer:
Increased
Explanation:
a sample of sodium reacts completely with 0.142 kg chlorine, forming 234 g of sodium chloride. What mass of sodium reacted
define conductor and insulator ?
Answer:
A conductor is an object or material that conducts heat, electricity, or sound. Examples of metals such as aluminum, steel, iron, and others. Meanwhile, insulators are objects that are difficult to conduct heat, such as ebonite, plastic, cloth, and others
Conductor is something which conducts electricity
examples are copper and other metals
Insulators are quite the opposite, they do not let electricity pass by them, examples are plastics, rubber and wood
the enzyme urea catalyses this reaction. If urea is added to a solution that contains ammonia and other nitrogen- containing compounds (but no urea), will the urea catalyse any reactions? Explain your answer?
Answer:
The enzyme urease catalyzes the hydrolysis of urea into ammonia and carbon dioxide. If urease is added to any compound which has no urea, it will not catalyze any reaction because if there is no urea, urease will not bind to any substance.
500mg of iron(ll) complex ferrous bisglycinate hydrochloride was dissolved in dilute H2SO4 and titrated with 0.0200 mol. dm3 KMnO4 18.10cm3 of KMnO4 solution were require to reach the end point the equation for the titration reaction is as follows 5Fe2+ + MnO4- + 8H+ - - > 5Fe2+ + Mn2+ +4H2O
Calculate the
1.number of moles of Fe2+ in the capsule
2.mass of iron in the capsul
3.molar mass of the iron (ll) complex assuming 1mole of the complex contains 1mole of iron. (Fe=55.9gmol-1)
Using the stoichiometry of the reaction, we can obtain the molar mass of the complex as 276 g/mol. The number of moles iron II as 0.00181 moles and the mass of iron II as 0.1 g.
Redox reactionA redox reaction is one in which there is loss or gain of electrons. The equation of the reaction is 5Fe2+ + MnO4- + 8H+ - - > 5Fe2+ + Mn2+ +4H2O
Number of moles of permanganate = 0.0200 mol. dm3 * 18.10cm3/1000 L
= 0.000362 moles
If 5 moles of iron II reacted with 1 mole of permanganate
x moles of iron II reacts with 0.000362 moles of permanganate
x = 5 moles * 0.000362 moles/ 1 mole
= 0.00181 moles of iron II
Recall that;
Number of moles = mass/molar mass
Molar mass of iron II = 56 g/mol
0.00181 moles = x/56 g/mol
x = 0.00181 moles * 56 g/mol = 0.1 g
If 1 mole of the complex contains 1 mole of iron then;
0.00181 moles = 500 * 10^-3/MM
MM= 500 * 10^-3/0.00181 moles
MM = 276 g/mol
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HBr + Al(OH)3 = H2O + AlBr3, how do I balance this equation?
Answer: This is an acid-base reaction (neutralization): Al(OH) 3 is a base, HBr is an acid. ; Colorless gas with a sharp, irritating odor.
...
Search by products (AlBr 3, H 2O)
1 HBr + Al(OH)3 → H2O + AlBr3
2 Al2O3 + HBr → H2O + AlBr3
Explanation:
Which element has four times as many protons in its nucleus than are found in Neon?
A.Si
B.Ca
C.Zr
D. Hg
Answer: Zr or Zirconium
Explanation: Neon has 10 Protons and four times ten is 40. And Zirconium has 40 protons the symbol for Zirconium is Zr
Neon has 10 protons, the element which has four times more protons than Neon in its nucleus is Zirconium(Zr).
What is a proton?Every atom has a proton, a subatomic particle, in its nucleus. The particle possesses an electrical charge that is positive and opposite to the electrons. A single proton has a mass of only [tex]1.673[/tex]×[tex]10^{-27}[/tex] kilogram when isolated. Just slightly less than a neutron's mass.The atomic number is the number of protons in an element's nucleus. Each element is given a unique identification by this number. The number of protons in the nucleus is constant in all atoms of a given element. The nucleus of an atom of pure hydrogen is made up entirely of one proton. All other elements' nuclei almost usually have neutrons in addition to protons.Protons need not just be found in atoms' nuclei. Protons acquire fascinating, peculiar, and potentially hazardous characteristics when they are discovered outside of atomic nuclei, which are analogous to neutrons in comparable situations. Protons have another characteristic, they can be accelerated by electric and/or magnetic fields because they carry an electric charge. During solar flares, a lot of high-speed protons and atomic nuclei holding them are released. The acceleration of the particles by the earth's magnetic field results in geomagnetic storms, which are ionospheric disturbances.To learn more about Proton, refer to https://brainly.com/question/1805828
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The table below gives the numbers of protons, electrons, and neutrons in four atoms.
Atom
Number of protons
Number of neutrons
Number of electrons
1
9
8
9
2
19
9
18
3
9
9
10
9
10
19
Based on the table, which atom has a charge of -1?
1
2
Оооо
3
4
Answer:
C. Atom 3
Explanation:
I'm sorry if I answered this late, but hope this helps! :D
Answer:
c
Explanation:
edge 2021
Please help! How many orbits will the Bohr models in the fourth period have?
Answer:
32 electron
Thus,the fourth level can hold up to 32 electrons,2 in the s orbital,6 in the three p orbitals,10 in the five d orbitals,and 14 in the seven f orbitals.
what is the maximum gauge pressure of waters that can measured using piezometer tube 2m high?
Answer:
P = ρgh = 1000 × 9.81×2 =19.62 kN/m^2
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What is the name of the cycle in which decomposes break down animal waste
A. Water cycle
B. Nitrogen cycle
C. Carbon dioxide-oxygen cycle
D. Rick cycle
Answer:
C. Carbon Dioxide-oxygen Cycle
Explanation:
Bacteria plays an important role in carbon cycle. Bacteria are decomposers that break down organic compounds. They decomposes plant and animal waste products and return carbon back in the environment.
Hope it helps:)))
What is a type of nuclear reaction in which the nucleus of a heavy atom splits into two or more smaller nuclei that have masses of relatively similar size?
A: gamma radiation
B: nuclear fusion
C: chain reaction
D: nuclear fission
state the bond angle and the molecular shape of NH3 and H2O.
Answer:
H2O forms a bent structure due to the presence of 2 lone pairs over O Atom. This makes the bond angle 104.5° NH3 forms a pyramidal structure due to presence of 1 lone pair. This makes the bond angle 107°
A patient cholesterol level and blood measures 149 mg/dL. What is the patients cholesterol level in grams per liter?
Answer:
fasting blood work
Explanation:
edge 2022
Why atoms in our body don’t
eject electrons?
Answer:
When there are too many protons, some of the outer protons are loosely bound and more free to react with the electron. But most atoms do not have too many protons, so there is nothing for the electron to interact with. As a result, each electron in a stable atom remains in its spread-out wavefunction shape.
In an atom, there is a nucleus made up of neutral charged, neutrons, and positively charged protons. The reason why electrons which are negatively charged, don't fly off is due to its stronger attraction to the protons. ... This, however, still allows the electrons to move around the nucleus of an atom.
2. I take and absorb the nutrients that your body needs from your
food and I put it in your bloodstream so your body can use it.
What am l?
Answer:
The small intestine
Explanation:
You are the small intestine
What is the pH of the solution obtained by mixing 68.00 mL of 0.280 M HCl and 60.00 mL of 0.125 M NaOH
The pH of the solution is approximately : 1.05
Given data :
volume of HCl = 68.00 mL = 0.068 L
concentration of HCl = 0.280 M
Volume of NaOH = 60 mL = 0.6 L
concentration of NaOH = 0.125 M
Determine the pH of the solutionFirst step : determine the number of mol of HCl and NaOH
mol of HCl = 0.068 * 0.280 = 0.0190 mol HCl
mol of NaOH = 0.06 * 0.125 = 0.0075 mol NaOH volume of
excess moles of H⁺ after reaction = 0.0190 - 0.0075 = 0.0115 mol
Next step : determine the pH value of the solution
Total volume of solution = 0.068 + 0.060 = 0.128
concentration of the solution [ H⁺ ] = excess moles / total volume
= 0.0115 / 0.128 = 0.0898
Therefore
pH = - log [ H⁺ ]
= - log ( 0.0898 ) = 1.047 ≈ 1.05
Hence we can conclude that The pH of the solution is approximately : 1.05 .
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